The point is that the one-way mirror film uses the incoming sunlight to boost the brightness - proportionally to the brightness of the sunlight. Hence you don't need a brighter CFL behind there. You don't need the additional circuit to adjust the output of the new super-bright CFL. Etc.Originally Posted by jcdillin
If we can find suitable reflective sheets, I think it'll be cheaper than building a new/additional CFL.
The layout would then be (back to front):
CFL + optical assembly
one-way reflective sheet
anti-reflective sheet / contrast enhancing sheet of some kind
This is the basic arrangement of most daylight readable LCDs out there. The other kind are ones which only have very bright CFLs but they are less common and, from what I've seen, more expensive. The most impressive sounding ones have all used the reflective approach in some form.